Prediction of cyclic large plasticity for prestrained structural steel using only tensile coupon tests

doi:10.1007/s11709-013-0219-5

Front Struc Civil Eng

2013, Vol. 7

Issue (4) : 466-476 https://doi.org/10.1007/s11709-013-0219-5

RESEARCH ARTICLE

Prediction of cyclic large plasticity for prestrained structural steel using only tensile coupon tests

Liang-Jiu JIA(

), Tsuyoshi KOYAMA, Hitoshi KUWAMURA

Department of Architecture, School of Engineering, the University of Tokyo, Tokyo 113-8656, Japan

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Abstract

Cold-formed steel members, which experience complicated prestrain histories, are frequently applied in structural engineering. This paper aims to predict cyclic plasticity of structural steels with tensile and compressive prestrain. Monotonic and cyclic tests on hourglass specimens with tensile and compressive prestrain are conducted, and compared with numerical simulations using the Chaboche model. Two approaches are taken in the simulation. The first requires only the monotonic tensile test data from the prestrained steels, and the second requires both the monotonic tensile test data from the virgin steel and the prestrain histories. The first approach slightly overestimates the compressive stress for specimens with tensile prestrain, while the second approach is able to accurately predict the cyclic plasticity in specimens with tensile and compressive prestrain.

Keywords cyclic plasticity prestrain Chaboche model mild steel

Corresponding Author(s): JIA Liang-Jiu,Email:LJ_JIA@hotmail.com

Issue Date: 05 December 2013

Cite this article:

Liang-Jiu JIA,Tsuyoshi KOYAMA,Hitoshi KUWAMURA. Prediction of cyclic large plasticity for prestrained structural steel using only tensile coupon tests[J]. Front Struc Civil Eng, 2013, 7(4): 466-476.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0219-5
https://academic.hep.com.cn/fsce/EN/Y2013/V7/I4/466

Fig.1 Illustration of backstresses in a uniaxial stress state for Chaboche model

Fig.2 Configurations of a coupon before and after necking occurs. (a) Before necking; (b) after necking

Fig.3 Illustration of assumptions in modified weighted factor method

Fig.4 Configuration of smooth round coupons

Fig.5 Setup of smooth round coupon tests

Fig.6 Numerical model simulating necking (unit: mm)

Fig.7 Load versus deformation curve obtained by different methods

Fig.8 Relationship between monotonic and cyclic true stress-true strain

Tab.1 Loading programs for specimens

Fig.9 Configuration of hourglass coupons before prestraining

Fig.10 Sampling of hourglass coupons

Fig.11 Setup for hourglass coupons

Fig.12 Cyclic loading history for KA09 and KA11

Fig.13 Comparison of experimental and numerical results for hourglass specimens. (a) KA08; (b) KA09; (c) KA10; (d) KA11

Fig.14 FE models for hourglass specimens. (a) Whole model; (b) partial model

Tab.2 Model parameters of Chaboche model

Fig.15 Comparison of coupon test result and KA01

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